You noticed a recent change to the BGP configuration on a PE router, the bgp scan time has been changed from the default value to 30s. Which three effects will this change have? (Choose three.)

Question

Options

• AThe BGP table will be examined and verified more frequently
• BThe BGP keepalive messages will be sent to the BGP peers at a faster rate
• CThe BGP table will be modified more quickly in the event that a next-hop address becomes
• DThe CPU load of the router will increase
• EThe minimum time interval between sending EBGP and IBGP routing updates will decrease
• FThe BGP convergence time will increase

• A
  84% (26)
• B
  10% (3)
• E
  3% (1)
• F
  3% (1)

Explanation

The BGP scan time (default 60 seconds) controls how frequently the BGP scanner process runs. This scanner walks the BGP table to verify the reachability of next-hop addresses using the RIB. Reducing it from 60s to 30s has three effects: (A) The BGP table is scanned and verified more frequently - TRUE, the scanner runs twice as often. (C) Next-hop changes are detected and acted upon faster - TRUE, if a next-hop becomes unreachable, the BGP table is updated sooner. (D) CPU load increases - TRUE, doubling the scan frequency increases scanner overhead. The other options are incorrect: BGP keepalive timers are independent of scan time (B is false); the EBGP/IBGP advertisement interval (MRAI) is a separate timer (E is false); and more frequent scanning improves, not degrades, convergence speed (F is false).

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